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(No Model.) 4 SheetsShe et 1 L. S. GHIGHESTER PULVERIZING APPARATUS.

No. 295,856. Patented Mar. 25, 1884.

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PULVERIZING APPARATUS.

PatentedM-a r 25. 1884.

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Patented Mar. 25. 1884.

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- (No Model.) 4 Sheets-Sheet 4 I L. GHIGHESTER. PULVERIZING APPARATUS... "No. 295,856) Y Patented Marl 25, 1884.

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"Nil? I, ll 6 Wm h M g? ATTORNEYS HNITE'D STATES PATENT Orrica.

LEWIS S. OHICHESTER, OFJERSEY CITY, NEW JERSEY, ASSIGNOB TO 0. M. EDWARD SGHROEDER, OF SAME PLACE.

PULVERIZING APPARATUS.

SPECIFICATION forming part of Letters Patent N 0. 295,856, dated March 25, 1884. Application filed June 27,1883. N model.)

To all whom, it may concern:

Be it known that I, LEWIS S. GHIOHESTER, of Jersey City, in the county of Hudson and State of New Jersey, have invented' certain new and useful Improvements in Pulverizing Apparatus, of which the following is a specification.

This invention has reference to an improved machine for pulverizing and reducing hard substances to any degree of fineness by the impact of the substance against a surface by the action of centrifugal power, which is aided by the air that is more or less compressed at the interior of the machine while the same is running, without employing artificial currents of air supplied by a separate air-compressor,

which latter feature forms the subject-matter of a separate application for Letters Patent, which was filed on December 29, 1882, Serial No. 80,406, and to which reference is made.

The invention consists in the combination of a revolving disk secured to a horizontal shaft, said disk being provided at its circumference with tapered ejectors, through which the material to be pulvegized is made to pass with great velocity and a stationary casing inclosing said disk, the inner circumference of which is provided with projections,against which the material to be pulverized is impacted. The material is fed to the interior of the machine by a suitable hopper near its center, and discharged from the same at the lower part by means of screened and valved openings. One side of the casing has a circular opening around the shaft, through which the air is drawn in. The casing is further pro vided at the upper part with tubular passages or conduits that connect openings in the side wall of the casing, so as to equalize the airpressure at the circumference of the casing. The other side wall of the casing is provided with radial conduit-tubes that connect openings near the circumference with a chamber around the shaft, whereby the material to be pulverized is returned to the center and forced again by centrifugal force, produced by the rotation of the disk, toward the circumference, whereby it is repeatedly taken up by the ejectors and impacted against the projections at the inner circumference of the casing.

In the accompanying drawings, Figures 1 and 2 represent side elevations of my improved pulverizing-machine, showing the same from opposite sides. Fig. 3 is avertical transverse section, and Fig. 4 is a vertical longitudinal section, through the casing, showing the disk and ejectors in elevation. Fig. 5 is asectional top view of one of the ejectors attached to the disk on line as a, Fig. 6. Fig. 6 is a sectional I side view of one of the ejectors. Fig. 7 is a front elevation of one of the ejectors.

A Similar letters of reference indicate corre' sponding parts. a t

A in the drawings represents a vertical disk, the thickness of which decreases slightly from the center toward the circumference, and which is secured by an enlarged center hub, d A, of greater thickness to a horizontal revolving shaft, B, that is supportedin bearings of upright standards 6. The disk A is provided at its circumference with a number of equidistant projections, a, to which funnel-shaped ejectors E are securely riveted by bolts pass ing through the flanges a, attached to the rear of said ejectors, and the intermediate projections, a, of the disk. The ejectors E are so attached to the projections a that the edges of their widest portions or mouths are located in radial lines drawn from the center to the circumference of the disk A. The bodies of the ejectors E are gradually contracted in width toward the outer ends, which have narrow discharge-openings 6, so that the substances which are taken up by the ejectors during the revolution of the diskare thrown with great velocity through the terminal openings 6 of the ejectors and impelled against interior projections, f, of the circumference of the inclosing-casing F. The ejectors are preferably constructed in two parts-to wit, a straight back plate, a", from which the flanges a project, and an angular front plate, a -said parts being united by screws a.

The shape of the side walls of the casing F corresponds to the shape of the funnel-shaped ejectors E, as shown in Fig. 3. The projec tionsf of the casing F are made with inclined sides, and preferably of hardened steel, they being so arranged in sections that when one side which has been exposed to wear by im 10o pact with the materials to be pulverized is worn out the sections can be reversed, and thereby the other side of the projections eX- posed to the impact of the material, whereby both sides may be fully utilized. The mate rials to be pulverized are fed through a hop per, F, arranged immediately above the shaft, near the center of the casing'F, as shown in Fig. 3. The hopper F opens into a chamber, F arranged around the shaft, in which the material is conducted along the inclined bottom of the chamber, and through an opening in the side wall of the casing F to the interior of the same, where it isdelivered into the path of the ejectors E, by which it is taken up and thrown at a high degree of speed, by centrifugal action, through the end openings, cc, of the ejectors, against the reducing projections f. The gradually-diminishing width of the funnel-shaped ejectors E and the high degree of speed at which they are rotated cause the air to be forced through with considerable pressure, by which the action of the centrifugal force is assisted, and the materials hurled with great force against the projections, so that they are reduced to powder by impact therewith. As each particle of the material is rapidly taken up and passed again and again, through the ejectors, it is impacted a great number of times until the required degree of fineness is obtained, when it is drawn off through suitable screened discharge-openings, f, at the lower part of the casing F, the screens of the dischargeopenings being made of different degrees of fineness, so as to separate thereby the material directly into different grades of fineness. The screened openings may be arranged with slides or valves (not shown in the drawings) by which they may be opened or closed, as required. They are connected by separate conducting-trunks (indicated by dotted lines in Fig. 3) to the settling chambers or bins on the story below, as customary in pulverizing machines. The screened discharge-openings f are arranged at both sides of the casing F, and serve to regulate the proper degree of fineness to which the materials are to be reduced, so as to separate them directly, without requiring them to be passed through a special bolting-machine.

Owing to the rapid rotation of the disk A, a current of air is formed at the interior of the casing, near the circumference of the same, which prevents the return of the finer particles toward the centerof the machine, so that they can be taken up again by the ejectors and thrown against the interior projections, f, of the casing. To break the continuity of this circumferential current of air, the casing F is provided in one or both side walls with openings g g, which are connected by tubular passages or conduits G, that serve to reduce the pressure at the interior of the casing, and cause thereby the breaking up of' the circumferential current of air. The openings 9, where the air and fine dust escape laterally into the conduit-tubes G, are preferably of larger size than the openings 9, where the air and dust are returned into the casing, the conduittubes G preferably diminishing correspondingly in width, whereby the passage of the air through the same is facilitated. The opposite side wall of the casing F is provided with openings it near the circumference of the casing, which are connected by radial tubes H with the supply-chamber F, and which serve for the purpose of returning the material from the circumference toward the center of the machine, where it is conducted again into the path of the ejectors and thrown by the same against the projections f, so as to be reduced to a greater degree of fineness. When ores and similar materials are to be reduced, the combined action of the centrifugal force and of the velocity of they air that carry the material through the funnel-shaped ejectors, is sufficient to reduce the same to a certain degree of fineness; but when a still greater de gree of fineness is required, as in pulverizing cereals and similar substances, it is preferable to use, in connection with the two forces referred to, as an additional force, artificiallycompressed air, which is conducted from an exterior source of supply through a suitable channel arranged in the shaft, disk, and ejectors, as will more fully appear in the application for Letters Patent heretofore referred to.

Having thus described my invention, I claim as new and desire to secure by Letters Pateutl. The combination of an inclosing-casing provided with projections on its inner circumference, a rotary disk within said casing, having tapered ejectors fixed thereto, and means for admitting and means for discharging the material, substantially as described.

2. The combinatian of an inclosing-casing provided with projections on its inner circumference, a rotary disk within said casing, provided with projections at its circumference,

tapered ej ectors provided with flanges bolted to said projections of the disk, the mouths of said ejectors being in radial lines with the center of the disk, and means for'supplying and means for discharging the material, substantially as described. a

8. The combination of an inclosing-casing "having interior projections on its inner circumference, and a rotary disk within said casing, provided with tapered ejectors at its circumference, said casin g being also provided with a supply-hopper and an enlarged chamber at one side, and screened discharge-openings at its lower part.

4. A detachable ejector for pulverizing-machines, consisting of a tapered body having a mouth at oneside and a discharge-opening at its contracted end, said ejector being provided with attaching-flanges, substantially as described.

5. The combination of an inclosing-casing having projections on its inner circumference, and openings in its side walls, lateral pressure relief tubes connecting said openings, a rotary disk within said casing, provided with ej ecto rs,

and means for supplying and means for discharging the material, substantially as described.

6. The combination of an inclosing-oasing having projections on its inner circumference,

a chamber near its center, and openings in the side walls, radial connecting-tubes that extend from said openingsto said chamber, a rotary disk within said casing, provided with ejectors, and means for supplying and means for discharging the material, substantially as described. i

7. The combination of an inclosing-casing having projections on its inner circumference, a chamber near its center, and openings in its side walls, a rotary disk within said casing, provided with ejectors, means for supplying the material, means for discharging the same when pulverized, lateral pressure-relief tubes connecting the openings in the side Walls of the casing, and radial conduit-tubes that extend from the openings in the side walls of the casing, near the circumference thereof, to the chamber near the center of the casing, substantially as described.

In testimony that I claim the foregoing as my invention Ihave signed my name in presence'of two subscribing witnesses.

1 LEWIS S. OHIOHESTER. Witnesses:

PArg L GoEPEL, SIDNEY MANN. 

